Without the atmosphere there would be no weather, no wind, rain, snow, or clouds. Air is all around us; we live at the bottom of a great ocean of air. It is invisible, but we can feel it when it moves. There are miles of air above us, pressing down with great weight on the earth and everything on it. Because air presses down on us from all directions at the same time, and because we are able to bear (忍受) this weight, we do not seem to feel it. But scientists have proved that air has this weight, and that anything that has weight creates(产生) a force called pressure. As changes in air pressure take place, they, make air move.

Air is a gas that expands(膨胀) when heated, gets lighter, and moves upward. When air is cooled, it gets heavier, sinks close to the earth's surface, and flows like water in a great river. As warn air rises, cold air rushes in to take its place. 'Thus winds originate (起源). The winds that blow high above us are caused by the warmer air running away from colder air. The wind we feel near the earth's surface is the heavy colder air trying hard to catch the warmer air. Changes in temperature cause the air to move. And of course there are many changes, so air movements are taking place practically all the time.

The first paragraph mainly tells us the causes of

A．why we don't feel air　　　　　　　B．why atmosphere is important to us

C．why there is air surrounding us　　D．why there is air pressure

Air moves under such conditions that

A．there is air pressure              B．the air is heavy

C．air pressure doesn't remain the same all the time  D．air comes up and down

Which of the following pictures best tells the movements of warm air and cold air?

According to the passage, in same areas if farmers who grow grapes (葡萄) light fires in the early morning, that is because the farmers want to________________．

A．drive away warm air  B．prevent cold air from coming to harm their plants

C．cause more windD．stop warm air running away

Without most people realizing it, there has been a revolution in office work over the last ten years．Before that time, large computers were only, used by large, rich companies that could afford the investment．With the advancement of technology, small computers have come onto the market, which are capable of doing the work which used to be done by much larger and expensive computers, so now most smaller companies can use them

The main development in small computers has been in the field of word processors (处理器) , or WPS as they are often called．40% of British offices are now estimated to have a word processor and this percentage is growing fast．

There are many advantages in using a word processor for both secretary and manager．The secretary is freed from a lot of daily work, such as re-typing letters and storing papers．He or she can use this time to do other more interesting work for the boss．From a manager's point of view, secretarial time is being made better use of and money can be saved by doing daily jobs automatically outside office hors．

But is it all good? If a lot of daily secretarial work can be done automatically, surely this will mean that fewer secretaries will be needed．Another worry is the increasing medical problems related to work with visual display units (显示器)．The case of a slow loss of sight among people using word processors seems to have risen greatly．It is also feared that if a woman works at a VDU for long hours, the unborn child in her body might be killed．Safety screens to put over a VDU have been invented but few companies in England bother to buy them．                                                                                 

Whatever the arguments for and against word processor, they are a key feature (特征) of this revolution in office practice．

Then years ago, smaller companies did not use large computers because_________．

A．these companies had not enough money to buy such expensive computers

     B．these computers could not do the work that small computers can do today

     C．these computers did not come onto the market

     D．these companies did not need to use this new technology

According to the writer, the main feature of the revolution in office work

   over the last ten years is __________．

   A．the saving of time and money   B．the use of computers in small companies

   C．the wide use of word processors       D．the decreasing number of secretaries

It is implied but not directly stated in the passage that with the use of word

   processors _________．

   A．some secretaries will lose their jobs

   B．daily jobs can be done automatically outside office hours

   C．medical problems related to work with a VDU have increased

   D．the British companies will make less money

Which of the following statements is NOT true?

   A．There are both advantages and disadvantages in using a word processor

   B．The British companies care much for the health of the people using word processors．

   C．The technology in the field of computers has been greatly advanced over the last ten years．

   D．Using word processors , secretaries can get more time to do more interesting work for their bosses．

It can be concluded from the passage that ________．

   A．safety screens are of poor quality

   B．working at a VDU for a long time is good for one's health

   C．more and more British offices will use word processors

   D．British companies will need fewer and fewer manages

With the theme "Cherishing the earth's resources, transforming the mode of development and living a low-carbon lifestyle," China's Ministry of Land and Resources held a ceremony this Thursday to mark the 41st World Earth Day, aims to generate new ideas of resource-saving, especially among the younger generation. In fact, Chinese young urbanities are turning to the seemingly trendy low-carbon lifestyle.

But for the country as a whole to achieve a low-carbon economy, it could mean ordinary people paying more for electricity, water, gas or simply every purchase. Of necessity, a low-carbon economy would be the basis of China's economic growth, yet it comes with a high price tag. Everybody longs for fresh air, clean water and healthy surroundings. But, who is going to pay for that?

For those who are still working hard for the basic necessities of life, sharing the cost of a greener environment can be taxing. For those who are already victimized by environmental pollution, additional expenditure for saving the environment is hard to bear. Behind all the lofty goals and loaded phrases of climate change negotiations, in everyday terms, the Chinese want to know whether companies will make them pay the cost of saving energy or whether government would come up with new levels.

They have reasons to worry. The recent hike in the charges of utilities, such as natural gas, water and electricity, have led to widespread public grievance(抱怨,牢骚), for the increases were imposed without proper public hearing. Besides the practice of monopoly State-owned enterprises raising prices at will does not seem to bode well for a low-carbon economy.

The government has a responsibility to strengthen regulation of utility charges and make the pricing mechanism more transparent. In the age of the low-carbon economy, the Chinese government needs to strike a new balance between public welfare and business competitiveness.

How far the initiatives toward a low-carbon economy succeed depends on whether they truly benefit ordinary people and is accepted by them. The majority cannot sacrifice their life to build a greener world for the few.

The author probably agrees to call on ____________.

A. more and more citizens to devote themselves to the “Low-carbon economy” for the sake of our earth immediately

B. the rich to generally pay for the bill, which aims at saving our planet.

C. our government to take proper measures to make the “Low-carbon economy” benefit more people

D. all the big enterprises to reduce their prices to build a greener world

According to the passage, which of the following statements is NOT TRUE?

A. Some people can’t afford their everyday expenses, let alone pay for a better environment.

B. Putting forward the “Low-carbon economy” costs much.

C. The balance between public welfare and business competitiveness in China now is not that good for the “Low-carbon economy”.

D. Now that it’s hard for us to make the “Low-carbon economy” into practice, our government should put it to an end.

The “Low-carbon economy” __________.

A. is beneficial only to the rich people

B. has led to widespread public grievance

C. can be realized when pigs fly in the sky

D. cannot be called success before it has been fully considered

What’s the best title of the passage?

A. China reaches out for younger generation to promote low-carbon lifestyle.

B. Low-carbon economy, acceptable or not?

C. Who will get the most benefit from the Low-carbon economy?

D. Put forward the new policy and save the world.

Without most people realizing it, there has been a revolution in office work over the last ten years. Before that time, large computers were only used by large rich companies that could afford the investment. With the advancement of technology, small computers have come on to the market which are capable of doing the work which used to be done by much larger and more expensive computers, so now most smaller companies can use them.

The main development in small computers has been in the field of word processors, or WPS as they are often called. 40% of British offices are now estimated(估计) to have a word processor and this percentage is growing fast.

There are many advantages in using a word processor for both secretary and manager. The secretary is freed from a lot of daily work, such as re-typing letters and storing papers. He or she can use this time to do other more interesting work for the boss. From a manager's point of view, secretarial time is being made better use of and money can be saved by doing daily jobs automatically outside office hours.

But is it all good? If a lot of daily secretarial work can be done automatically, surely this will mean that fewer secretaries will be needed. Another worry is the increasing medical problems related to work with visual display units(显示器). The case of a slow loss of sight among people using word processors seems to have risen greatly. It is also feared that if a pregnant woman works at a VDU for long hours, an unborn child in her body might be killed. Safety screens to put over a VDU have been invented but few companies in England bother to buy them.

Whatever the arguments for and against word processors, they are a key feature of this revolution in office practice.

Ten years ago, large computers were only used by large companies because ________ .

A. small companies did not have enough money to buy such expensive computers

B. large computers could not do the work that small companies can do today

C. large computers did not come on to the market

D. small companies did not need to use this new technology

According to the writer, the main progress made in office work over the last ten years is ________ .

A. the saving of time and money            B. the use of computers in big companies

C. the wide use of word processors          D. the decreasing number of secretaries

We can infer from the passage that with the use of word processors ________ .

A. some secretaries will lose their jobs

B. daily jobs can be done automatically outside office hours

C. medical problems related to work with a VDU have increased

D. the British companies will make less money

Without most people realizing it, there has been a revolution in office work over the last ten years．Before that time, large computers were only, used by large, rich companies that could afford the investment．With the advancement of technology, small computers have come onto the market, which are capable of doing the work which used to be done by much larger and expensive computers, so now most smaller companies can use them

The main development in small computers has been in the field of word processors (处理器) , or WPS as they are often called．40% of British offices are now estimated to have a word processor and this percentage is growing fast．

There are many advantages in using a word processor for both secretary and manager．The secretary is freed from a lot of daily work, such as re-typing letters and storing papers．He or she can use this time to do other more interesting work for the boss．From a manager's point of view, secretarial time is being made better use of and money can be saved by doing daily jobs automatically outside office hors．

But is it all good? If a lot of daily secretarial work can be done automatically, surely this will mean that fewer secretaries will be needed．Another worry is the increasing medical problems related to work with visual display units (显示器)．The case of a slow loss of sight among people using word processors seems to have risen greatly．It is also feared that if a woman works at a VDU for long hours, the unborn child in her body might be killed．Safety screens to put over a VDU have been invented but few companies in England bother to buy them．                                                                                  

Whatever the arguments for and against word processor, they are a key feature (特征) of this revolution in office practice．

Then years ago, smaller companies did not use large computers because_________．

A．these companies had not enough money to buy such expensive computers

     B．these computers could not do the work that small computers can do today

     C．these computers did not come onto the market

     D．these companies did not need to use this new technology

According to the writer, the main feature of the revolution in office work

   over the last ten years is __________．

   A．the saving of time and money   B．the use of computers in small companies

   C．the wide use of word processors       D．the decreasing number of secretaries

It is implied but not directly stated in the passage that with the use of word

   processors _________．

   A．some secretaries will lose their jobs

   B．daily jobs can be done automatically outside office hours

   C．medical problems related to work with a VDU have increased

   D．the British companies will make less money

Which of the following statements is NOT true?

   A．There are both advantages and disadvantages in using a word processor

   B．The British companies care much for the health of the people using word processors．

   C．The technology in the field of computers has been greatly advanced over the last ten years．

   D．Using word processors , secretaries can get more time to do more interesting work for their bosses．

It can be concluded from the passage that ________．

   A．safety screens are of poor quality

   B．working at a VDU for a long time is good for one's health

   C．more and more British offices will use word processors

   D．British companies will need fewer and fewer manages